* {
  margin: 0;
  padding: 0;
}

ul li {
  list-style: none;
}

main {
  width: 960px;
  height: 500px;
  border-radius: 10px;
  margin: 50px auto;
}

main h4 {
  height: 100px;
  line-height: 100px;
  text-align: center;
}

.tabsbox {
  width: 900px;
  margin: 0 auto;
  height: 400px;
  border: 1px solid lightsalmon;
  position: relative;
}

nav ul {
  overflow: hidden;
}

nav ul li {
  float: left;
  width: 100px;
  height: 50px;
  line-height: 50px;
  text-align: center;
  border-right: 1px solid #ccc;
  position: relative;
}

nav ul li.liactive {
  border-bottom: 2px solid #fff;
  z-index: 9;
}

#tab input {
  width: 80%;
  height: 60%;
}

nav ul li span:last-child {
  position: absolute;
  user-select: none;
  font-size: 12px;
  top: -18px;
  right: 0;
  display: inline-block;
  height: 20px;
}

.tabadd {
  position: absolute;
  /* width: 100px; */
  top: 0;
  right: 0;
}

.tabadd span {
  display: block;
  width: 20px;
  height: 20px;
  line-height: 20px;
  text-align: center;
  border: 1px solid #ccc;
  float: right;
  margin: 10px;
  user-select: none;
}

.tabscon {
  width: 100%;
  height: 300px;
  position: absolute;
  padding: 30px;
  top: 50px;
  left: 0px;
  box-sizing: border-box;
  border-top: 1px solid #ccc;
}

.tabscon section,
.tabscon section.conactive {
  display: none;
  width: 100%;
  height: 100%;
}

.tabscon section.conactive {
  display: block;
}
